How to output all first elements from all keys of a dictionary of lists of tuples?

Question

A snippet from my dictionary my_emotions looks like this:

   {'art': [(2135, ['anticipation', 'joy', 'sadness', 'surprise'])],
     'bad': [(7542, ['anger', 'disgust', 'fear', 'sadness'])],
     'beautiful': [(4000, ['joy']), (4425, ['joy'])],
     'boy': [(777, ['disgust']), (2634, ['disgust']), (4442, ['disgust'])],
     'ceremony': [(2948, ['joy', 'surprise'])],
     'child': [(4263, ['anticipation', 'joy'])],
     'detention': [(745, ['sadness']),
                   (3461, ['sadness']),
                   (3779, ['sadness']),
                   (4602, ['sadness'])],...]}

I am aiming to output all the first numbers of every tuple that occur in every key into a list.

So far I've tried this:

for key in sorted(my_emotions.keys()):
    auto_emotion_indices = [].append(my_emotions[key][0][0])

but it outputs None .

I tried printing the output to see what I'm getting, using:

for key in sorted(my_emotions.keys()):
    auto_emotion_indices = [].append(my_emotions[key][0][0])

which outputs the part of the dictionary that I want (the numbers aka indices), but only the first ones when there's multiple occurances for a key.

Eg for the key detention : I only get 745 , but not 3461 , 3779 etc...

A desired output would be:

my_list = [2135, 7542, 4000, 4425, 777, 2634, 4442, 2948, 4263, 745, 3461, 3779, 4602...]

What should I add to also include the rest of those numbers into my list?

Thanks in advance!

Answer 1

Defining my_emotions as:

my_emotions = {'art': [(2135, ['anticipation', 'joy', 'sadness', 'surprise'])],
        'bad': [(7542, ['anger', 'disgust', 'fear', 'sadness'])],
        'beautiful': [(4000, ['joy']), (4425, ['joy'])],
        'boy': [(777, ['disgust']), (2634, ['disgust']), (4442, ['disgust'])],
        'ceremony': [(2948, ['joy', 'surprise'])],
        'child': [(4263, ['anticipation', 'joy'])],
        'detention': [(745, ['sadness']),
                      (3461, ['sadness']),
                      (3779, ['sadness']),
                      (4602, ['sadness'])]}

This pythonic line will do the trick:

my_list = [number for emotion in sorted(my_emotions.keys()) for number, _ in my_emotions[emotion]]

A less pythonic way is to do it with two for loops:

my_list = []
for emotion in sorted(my_emotions.keys()):
    for number, _ in my_emotions[emotion]:
        my_list.append(number)

If you want to check what is being added just insert a print statement in the inner loop. In both cases the output is:

[2135, 7542, 4000, 4425, 777, 2634, 4442, 2948, 4263, 745, 3461, 3779, 4602]

Answer 2

    auto_emotion_indices = []

    for keys in  sorted(my_emotions.keys()):
        for item in my_emotions[keys]:
            auto_emotion_indices.append(item[0])

    print(auto_emotion_indices)